Thomas kewnham



(No Model.)

T NEWNHAM.

SAW SWAGH.

Patented Apr, 14, 1885.

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THOMAS NEWNHAM, OF WAINRIGHT, GEORGIA.

SAW-SWAGE.

SPECIFICATION forming part of Letters Patent No. 315,820, dated April 14, 1885.

Application filed December 4, 1884.

To aZZ whom it may concern.-

Be it known that I, THOMAS NEWNHAM, of -Wainright, in the county of Charlton and State of Georgia, have invented a new and Improved Saw-Swage, of which the following is a full, clear, and exact description.

My invention relates to swages for setting the teeth of saws, and has for its object to improve the construction of tools of this class, so as to provide a simple and efficient swage which will set the saw-teeth from the under or throatedges of the teeth, thereby insuring better working clearance of the teeth, and one which will set the teeth gradually and by a rolling action of the swaging-die, allowing hard or brittle saw-teeth to be set without breaking or cracking their points.

The invention consists in various constructions and combinations of parts of the sawswage, all as hereinafter fully described and claimed.

Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure l is a sectional side elevation of the saw-swage with the left-hand-side plate or body section removed, and showing the swage adjusted to the teeth of a circular saw, which is shown in part and in dotted lines. Fig. 2 is an edge view of the swage with the sawplate in dotted lines, and Fig. 3 is a perspective view of the swaging-die.

I make the body of the saw-swage in two side parts or sections-a right-hand section, A, and a left-hand section, Bwhich are rabbeted at their opposing faces so as to form, when secured together by the bolts or screws 0 G, the central groove, D, into which the saw-blade E (seen dotted) enters when the swage is placed on the saw for setting its teeth, as hereinafter more fully explained. The saw-groove D is formed with its base or shoulder, which stands uppermost on the transverse line d, tangent from and at the upper edge of the socket or recess f, formed one half in each section A B, to receive the swaging die or head F, and thence the base of the groove D curves around the socket f, as at d, and ranges thence in an opposite tangential line d from the lower side of the die-recess, as shown clearly in Fig. 1.

At G is shown the anvil-block or bed-die,

(No model.)

1 along which the die F acts to swage the saw-teeth. Said anvil-block G consists of a piece of hardened steel, which is set with its lower edge about in line with the upper shoulder, d, of the saw-groove D, and may be formed on or fixed to either of the sections A B and enter a socket in the inner face of the other section. I show the anvil-block fixed in the section A, as at present preferred. The die F has opposite gudgeons or shaft-s, H I, which are journaled in the sections A B, and the shaft I is extended to receive the handcrank J, by turning which the die F may be rotated.

As seen more clearly in Figs. 1 and 3, the die F is cylindrical in form, and is fitted to revolve in the recess f, and is provided with the hardened-steel swaging-roller bits K L, which are fitted in transverse grooves opening through the periphery of the die-block. I make the forward roller,K,preferably of less diameter than the roller L behind it, and I set the roller L so it projects a greater distance from the periphery of the die-block than the roller K, so that as the die F is rotated to swage the saw-tooth the roller K first will act on the tooth to partly swage it and the roller L will follow to complete the swaging of the tooth, this gradual swaging action permitting the perfect swaging of brittle saw-teeth without breaking off their points or cracking them so they break off when the saw is put to use.

At b b are shown short studs or lugs projecting from the section B into the saw-slot D, to hold the saw-blade away from the face of section B for a distance a little greater than the set of the sawteeth at that side of the sawblade, so that the set of the teeth shall not be changed or the teeth damaged by contact with the section B as the swage is placed on and moved around the saw in setting the teeth. If desired, the studs 1) b may be separate blocks or bits held in sockets of the section B, and they may have roughened outer faces to enable the swage to be more firmly clamped to the saw by means of a clamp block or plate, M, set loosely in a. recess or socket of the section A, and forced inward against the sawblade and toward the stud b by a screw, N,

O O, threaded into section A, with their ends facing the lower stud, I).

P Q are screws which are fitted to threaded threaded into section A, and also by screws The saw E is clamped or held by any suitable devices,or need not be removed from its mandrel, and the swage is placed over the sawblade so that the point of one of the saw-teeth,

as at 6, will stand between the anvil-block G and the die F and in front of the die-roller K. The screwP now will be adjusted totake against the outer edge, e, of the tooth e, and the screw Q will be adjusted to bear on the outer edge of the preceding saw-tooth 6", so that the eX- treme point of the tooth e will stand in proper relation to the block G and roller-die F; and the screws P Q, when once set, will serve for gaging all the teeth of the saw to the swaging block and die.

When the saw-tooth e and gagingscrews P Q have been adjusted,as last above described, the clamp-screws N 0 will be tightened to hold the swage to the saw, and the crank J will be turned forward to bring the rollers K L into contact with the tooth e to swage or set its point, the rollers turning easily in their sockets in the die-block F, so that they swage the tooth by a rolling contact, which does not tend to break or injure the metal of the tooth. It will be noticed that the rollers K L act at the inner or throat edges, 0 0f the teeth, to leave them broader than the top edges, 6, of the teeth at and near their points, thus giving a better working clearance to the teeth than if they were swaged broader at the outer edges, 6', as usually is done, and the die-rollers have a tendency to draw out or lengthen the sawteeth, which often are shortened by other swaging processes, and after the roller-die F K L has set the teeth, very little filing is required to dress the teeth to a practically perfect cutting-edge. As each tooth is set the swage will be moved to act on the next tooth, as above described. I

I do not limit myself to the use of two swaging-rollers in the die-block F, as but one roller or more than two rollers may be employed, and when two or more rollers are used they need not be of like diameter, and will be set so that the rearward rollers project farthest from the periphery of the die-block; but the two rollers K L, as shown, are preferred.

It is evident that by continuing the shoulder d of the saw-slot D straight across the swage, as indicated by the dotted line at t in Fig. l, and setting the screws 0 above the shoulder, and making the gagingscrews P Q of about the same length, the swage will be adapted to setting the teeth of saws, which are straight or slightly curved at the cuttingedge.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A saw-swage constructed with a groove or recess for the saw-blade, and .ananvil-die,

.in combination with a coacting rotating die fitted with a series of swaging-rollers, the rearward swaging-rollers projecting farther beyond the periphery of the rotating die than the forward rollers, substantially as herein set forth.

2. A saw-swage constructed with a groove or recess for the saw-blade, and an anvi1-die, in combination with a coacting rotating die fitted with a series of swaging-rollers, the rearward swaging-rollers projecting farther beyond the periphery of the rotating die than the forward rollers, and the forward rollers being smaller in diameter than the rearward rollers, substantially as herein set forth.

3. A saw-swage constructed with a sawgroove, D, and an anvil-die, G, in combination with a rotating die, F, fitted with one or more swaging-rollers projecting beyond its periphery, and the gage-screws P Q, fitted at opposite sides of the swaging-dies and entering the saw-groove, substantially as herein set forth. I

4. A saw-swage constructed with a sawgroove, D, and an anvil-die, G, in combination with a rotating die, F, fitted with one or more swaging-rollers projecting beyond its periphery, the gage-screws P Q, the clampscrews N O, and means for turning the rotating-die, substantially as herein set forth.

5. A saw-swage constructed with a sawgroove, D, coacting anvil and rotating swaging-dies G F, and gage-screws P Q, as specified, in combination with the studs b b and opposite clamping-screws, substantially as herein set forth.

6. A saw-swage constructed with a groove, D, and dies G F, in combination with gagescrews P Q, studs b b, clamp-block M, and screws N O, substantially as herein set forth.

7. Asaw-swage constructed with its body portion in two sections, A 13. having a groove, D, between them, and dies G F, in combination with gage-screws P Q, studs b b, clampblock M, and screws N O, substantially as herein set forth.

8. The rotatable saw swaging die, constructed with a head or block, F, fitted with a series of swaging-rollers, the rearward rollers projecting farther beyond the periphery of the die-block than theforward rollers, substantially as herein set forth.

9. The rotatable saw swaging die, constructed with a head or block, F, fitted with a series of swaging-rollers, the rearward rollers projecting'farther beyond the periphery of the die-block than the forward rollers, and the forward rollers being smaller in diameter than the rearward rollers, substantially as herein set forth.

THOMAS N EWN H AM.

Witnesses:

D. W. KUNE, J. B. J cuts.

IIO 

